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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2023 Cloud Software Group, Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JasperReports is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JasperReports. If not, see .
*/
package net.sf.jasperreports.engine.util.json;
import java.io.StringReader;
import java.util.List;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRRuntimeException;
import net.sf.jasperreports.engine.json.JRJsonNode;
import net.sf.jasperreports.engine.json.JsonNodeContainer;
import net.sf.jasperreports.engine.json.expression.JsonQLExpression;
import net.sf.jasperreports.engine.json.expression.JsonQLExpressionEvaluator;
import net.sf.jasperreports.engine.json.parser.JsonQueryLexer;
import net.sf.jasperreports.engine.json.parser.JsonQueryParser;
import net.sf.jasperreports.engine.json.parser.JsonQueryWalker;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* @author Narcis Marcu ([email protected])
*/
public class DefaultJsonQLExecuter implements JsonQLExecuter {
private static final Log log = LogFactory.getLog(DefaultJsonQLExecuter.class);
private JsonQLExpressionEvaluator evaluator;
public DefaultJsonQLExecuter() {
evaluator = new JsonQLExpressionEvaluator();
}
@Override
public List selectNodes(JRJsonNode rootNode, String expression) throws JRException {
JsonNodeContainer container;
if (expression != null && expression.trim().length() > 0) {
container = evaluator.evaluate(getJsonQLExpression(expression), rootNode);
if (container != null) {
return container.getContainerNodes();
}
} else {
container = new JsonNodeContainer(rootNode);
return container.getContainerNodes();
}
return null;
}
@Override
public JRJsonNode selectNode(JRJsonNode contextNode, JRJsonNode rootNode, String expression) throws JRException {
if (expression != null && expression.trim().length() > 0) {
JsonQLExpression jsonQLExpression = getJsonQLExpression(expression);
JRJsonNode node = contextNode;
if (jsonQLExpression.isAbsolute()) {
node = rootNode;
}
JsonNodeContainer container = evaluator.evaluate(jsonQLExpression, node);
if (container != null) {
return container.getNodes().get(0);
}
} else {
return contextNode;
}
return null;
}
public JsonNodeContainer evaluateExpression(JRJsonNode jrJsonNode, String expression) {
if (expression != null && expression.trim().length() > 0) {
return evaluator.evaluate(getJsonQLExpression(expression), jrJsonNode);
}
return null;
}
public JsonQLExpressionEvaluator getEvaluator() {
return evaluator;
}
protected JsonQLExpression getJsonQLExpression(String expression) {
try {
JsonQueryLexer lexer = new JsonQueryLexer(new StringReader(expression.trim()));
JsonQueryParser parser = new JsonQueryParser(lexer);
parser.pathExpr();
JsonQueryWalker walker = new JsonQueryWalker();
return walker.jsonQLExpression(parser.getAST());
} catch (Exception e) {
if (log.isDebugEnabled()) {
log.debug("Exception is of type: " + e.getClass());
}
throw new JRRuntimeException(e);
}
}
}